CN211219563U - Blade root bolt fastening device of wind generating set - Google Patents
Blade root bolt fastening device of wind generating set Download PDFInfo
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- CN211219563U CN211219563U CN201922447694.4U CN201922447694U CN211219563U CN 211219563 U CN211219563 U CN 211219563U CN 201922447694 U CN201922447694 U CN 201922447694U CN 211219563 U CN211219563 U CN 211219563U
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Abstract
The utility model relates to a wind generating set blade root bolt-up device, wind generating set blade root bolt-up device includes: a torque wrench for generating a rotational torque; a force translation tool having a first bore to receive the rotating head of the torque wrench and a second bore to receive a blade root bolt for transmitting a rotational torque generated by the torque wrench to the blade root bolt; and the ultrasonic probe is fixed on the blade root bolt fastening device of the wind generating set and used for sensing the axial force of the blade root bolt in real time. The change of the axial force of the blade root bolt can be measured in real time in the construction process through the ultrasonic probe, and the discreteness of the axial force of the blade root bolt can be reduced.
Description
Technical Field
The utility model relates to a wind-powered electricity generation technical field, more specifically relates to a wind generating set blade root bolt-up device.
Background
The bolt axial force refers to the pretightening force of the bolt, and is the pretightening force which is generated between the bolt and the connected piece along the axial lead direction of the bolt under the action of torque in the bolt tightening process.
The variable pitch bearing is arranged between the blade and the hub, the inner ring and the outer ring of the variable pitch bearing are respectively connected with the blade and the hub through bolts, and the blade rotates relative to the central axis of the blade root to realize the variable pitch function. The blade root bolt works under alternating loads and the reliability of the bolted connection depends on whether the axial force of the bolt is adequate.
In engineering construction, the torque or moment of the torque wrench is generally used to calculate the axial force of the bolt. However, due to the friction of the thread pair affected by many factors, although a certain torque is set, the predicted bolt axial force cannot be obtained accurately. For example, in extreme cases where the nut engages a threaded surface, the bolt may be subjected to very little pretension despite a sufficiently large tightening torque. This results in a tightening torque that is not effective in characterizing the bolt axial force (or pretension) due to the uncertainty in the torque coefficient between the torque and pretension to which the bolt is subjected.
In addition, the dispersion of the pretension force of each bolt arranged along the circumference of the blade root of the blade is usually too large, and the bolt pretension force dispersion coefficient (dispersion) represents the difference of the pretension force of each bolt in the circumference of the blade root. The bolt can be subjected to plastic deformation due to overlarge pretightening force, so that the pretightening force is reduced, fatigue damage is accelerated, and the connection flange surface slides due to the overlong pretightening force, so that the bolt bears shear stress, and fatigue fracture is accelerated. In the prior art, for example, in the case of bolting by the moment method, the coefficient of variation of the bolt axial force is about 1.4 to 1.5, and in the case of bolting by the angle method, the coefficient of variation of the bolt axial force is about 1.3.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem that exists among the prior art, the utility model aims at providing a wind generating set blade root bolt fastener that can real-time measurement blade root bolt axial force change.
According to the utility model discloses an aspect provides a wind generating set blade root bolt fastening device, wind generating set blade root bolt fastening device includes: a torque wrench for generating a rotational torque; a force translation tool having a first bore to receive the rotating head of the torque wrench and a second bore to receive a blade root bolt for transmitting a rotational torque generated by the torque wrench to the blade root bolt; and the ultrasonic probe is fixed on the blade root bolt fastening device of the wind generating set and used for sensing the axial force of the blade root bolt in real time.
Preferably, the torque wrench may be an electric wrench, and the wind turbine generator system blade root bolt fastening device may further include a controller, and the controller may receive a signal indicating an axial force of the blade root bolt from the ultrasonic probe, generate a rotation speed control signal based on the signal, and provide the rotation speed control signal to the torque wrench.
Preferably, the ultrasound probe may be disposed directly above the second aperture.
Preferably, the ultrasonic probe may be disposed in the second hole without contacting a wall of the second hole.
Preferably, the second hole may be adapted to receive a bolt head of the root bolt, and the ultrasonic probe may be adapted to align the bolt head in an axial direction of the root bolt to measure an axial force of the root bolt in real time.
Preferably, a first rotatable member may be disposed in the first bore to mate with a rotating head of the torque wrench, and a second rotatable member may be disposed in the second bore to mate with a bolt head of the root bolt.
Preferably, the force translation tool may comprise a torque transfer component that transfers torque between the first rotatable component and the second rotatable component.
Preferably, the ultrasound probe may be an electromagnetic ultrasound probe.
Through adopting the utility model discloses a wind generating set blade root bolt fastener can be in the change of the axial force of construction real-time measurement blade root bolt to can reduce the discreteness of the axial force of blade root bolt.
In addition, the operation of the torque wrench applying the torque to the blade root bolt can be controlled according to the real-time measured axial force of the blade root bolt, so that the preset bolt axial force can be achieved more accurately.
In addition, the fatigue strength of the bolt can be improved and the service life of the bolt can be prolonged by reducing the discreteness of the axial force of the bolt; in addition, for the same node, fewer bolts can be used, and the material utilization rate is improved; in addition, the operation and maintenance times of the bolts can be reduced, and the cost is saved.
Drawings
Fig. 1 shows a schematic perspective view of a wind turbine blade root bolt fastening arrangement according to an embodiment of the invention;
fig. 2 shows a schematic view of an ultrasonic probe and a force translation tool in a wind turbine blade root bolt fastening arrangement in relation to the position of the blade root bolt according to an embodiment of the invention;
fig. 3 shows a schematic block diagram of a wind turbine blade root bolt fastening arrangement according to an embodiment of the invention;
fig. 4 shows a schematic perspective view of a force translation tool according to an embodiment of the present invention;
description of reference numerals:
1-a blade; 2-a pitch bearing; 10-blade root bolt fastening means; 11-torque wrench; 12-force translation tooling; 13-an ultrasound probe; 15-a controller; 20-root bolt; 21-bolt head; 121-a first rotatable member; 122-a second rotatable member.
Detailed Description
In order to better understand the technical idea of the present invention for those skilled in the art, the following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.
In a wind power plant, the blade 1 is fastened to the hub or the pitch bearing 2 by means of a root bolt 20, and in case of a wind power plant with a pitch function, the blade 1 is connected to the pitch bearing 2, for example, to the outer ring of the pitch bearing 2. As schematically shown in fig. 1 and 2, one end of the root bolt 20 is a bolt head 21, the other end has an external thread, the pitch bearing 2 is internally provided with a threaded hole matching the external thread of the root bolt 20, and the root bolt 20 passes through a bolt hole in the attachment flange of the blade 1 from the attachment flange side of the blade 1 and is screwed into the threaded hole of the pitch bearing 2.
As shown in fig. 1, the utility model provides a wind generating set blade root bolt-fastening device 10 has integrated moment spanner 11, power translation frock 12 and ultrasonic probe 13.
The torque wrench 11 is used to generate a rotational torque, and the force translation tool 12 has a first hole to receive the rotating head of the torque wrench 11 and a second hole to receive the root bolt 20 for transmitting the rotational torque generated by the torque wrench 11 to the root bolt 20. Since the root bolt 20 is usually arranged in close proximity to the surface of the root and other components may be arranged around the root, the space for arranging the torque wrench 11 directly above the root bolt 20 is limited, and the torque wrench 11 applying the rotation torque can be spaced apart from the blade 1 by a certain distance by using the force translation tool 12, which facilitates the fastening of the root bolt 20.
The terms referred to herein with respect to spatial orientation, such as "above", "directly above", "below", "directly below", and the like, are merely intended to facilitate explanation of structural components of the device and positional relationships between respective members with reference to the drawings, and do not limit actual orientations of the device during actual operation, manufacture, transportation, or the like, for example, in actual use, the terms "above", "directly above", "below", "directly below" may change to other orientations.
The ultrasonic probe 13 may be fixed to the root bolt fastening device 10 for measuring the axial force of the root bolt 20 in real time. By measuring the actual axial force of the root bolt 20 accurately and in real time, the operation of the torque wrench 11 can be further accurately adjusted.
Preferably, the torque wrench 11 may be an electric wrench, and the ultrasonic probe 13 may be an electromagnetic ultrasonic probe which detects the axial force of the bolt using an electromagnetic ultrasonic technique, and may measure the axial force of the bolt in real time by contacting the bolt or not contacting the bolt.
Furthermore, as shown in fig. 3, the blade root bolt-fastening device 10 further comprises a controller 15, and the controller 15 is in communication connection with the torque wrench 11 and the ultrasonic probe 13, respectively. The controller 15 may receive a signal from the ultrasonic probe 13 indicating the axial force of the root bolt 20 and generate a rotational speed control signal based on the signal and then provide the rotational speed control signal to the torque wrench 11. That is, the blade root bolt fastening device 10 simultaneously integrates the torque wrench 11, the ultrasonic probe 13, and the controller 15, the ultrasonic probe 13 detects the axial force of the blade root bolt 20 in real time during the fastening of the blade root bolt 20, and the controller 15 can control the rotation speed of the torque wrench 11 according to the axial force of the blade root bolt 20 detected by the ultrasonic probe 13.
As mentioned above, the blade root bolt 20 has one end in the form of a bolt head 21 and the other end screwed into the internal thread of the pitch bearing 2, the bolt head 21 being exposed to the outside. As shown in fig. 1 and 2, during fastening of the root bolt 20, the second hole of the force translation tool 12 is used for receiving a bolt head 21 of the root bolt 20, and the ultrasonic probe 13 is arranged to align the bolt head 21 in the axial direction of the root bolt 20. That is, during tightening of the root bolt 20, the ultrasonic probe 13 and the second hole of the force-translating tool 12 are located on one axial side of the root bolt 20, and as shown in fig. 1 and 2, the ultrasonic probe 13 and the second hole of the force-translating tool 12 are both located above the root bolt 20. The ultrasonic probe 13 may be disposed directly above the second hole of the force translation tool 12, or may be disposed in the second hole of the force translation tool 12 without contacting the wall of the second hole.
As shown in fig. 4, a first rotatable member 121 matching the rotating head of the torque wrench 11 is disposed in the first hole of the force translation tool 12, and a second rotatable member 122 matching the bolt head 21 of the root bolt 20 is disposed in the second hole. The ultrasound probe 13 may be disposed in the center of the second rotatable member 122 and not in contact with the inner sidewall of the second rotatable member 122. During tightening of the root bolt 20 the second rotatable part 122 cooperates with the bolt head 21 of the root bolt 20 and brings about rotation of the root bolt 20. The ultrasonic probe 13 may not contact the bolt head 21 of the root bolt 20 and also not contact the second rotatable member 122, so during the measurement the ultrasonic probe 13 is aligned with the bolt head 21 in the axial direction of the root bolt 20 and the ultrasonic probe 13 is kept stationary to sense the axial force of the root bolt 20 in real time.
Furthermore, the force translation tool 12 comprises a torque transmission member (not shown) for transmitting a torque between the first rotatable member 121 and the second rotatable member 122, whereby the rotational torque generated by the torque wrench 11 is transmitted via the first rotatable member 121 to the torque transmission member inside the force translation tool 12, then to the second rotatable member 122, then via the second rotatable member 122 to the bolt head 21 of the root bolt 20, whereby a torque is applied to the bolt head 21 for tightening thereof. Preferably, the torque transmission member may be a gear transmission member or a belt transmission member or the like.
During fastening the blade root bolt 20 using the blade root bolt fastening device 10, taking the torque wrench 11 as an electric wrench and the ultrasonic probe 13 as an electromagnetic ultrasonic probe as an example, first, the power is turned on, the torque wrench 11 outputs a rotation torque and transmits the torque to the bolt head 21 of the blade root bolt 20 through the force translation tool 12, and simultaneously, the ultrasonic probe 13 measures the axial force on the blade root bolt 20 in real time by using an electromagnetic ultrasonic technology, and outputs a signal corresponding to the axial force (for example, outputs a voltage signal of 0 to 10V) through the controller 15.
The desired preset axial force of the root bolt 20 may be set, for example, the desired preset axial force of the root bolt 20 may be stored in the controller 15. If the axial force of the root bolt 20 measured by the ultrasonic probe 13 reaches 90% of the preset axial force, the rotation speed of the torque wrench 11 (e.g., an electric wrench) may be reduced, and if the axial force of the root bolt 20 measured by the ultrasonic probe 13 reaches 100% of the preset axial force, the torque wrench 11 may be stopped. That is, the controller 15 may determine whether the axial force measured by the ultrasonic probe 13 is greater than or equal to 90% of the preset axial force during the construction, and if so, reduce the rotation speed of the torque wrench 11, for example, to 1rpm, to slowly apply the torque during the approach to the preset axial force of the blade root bolt 20, so that the preset axial force can be accurately reached. If the preset axial force is less than 90%, normal application of torque can be continued and the axial force can be measured in real time.
After the preset axial force is reached, the torque wrench 11 stops, the force translation tool 12 and the ultrasonic probe 13 may be removed from the root bolt 20 and the root bolt fastening device 10 may be moved to the next target root bolt.
The utility model discloses an ultrasonic probe (for example, electromagnetism ultrasonic transducer) utilizes ultrasonic wave technique (for example, electromagnetism ultrasonic wave technique) to control the installation of blade root bolt accurately for axial force deviation dispersion coefficient after the construction of blade root bolt can be controlled at 1.2 better level even, compares the bolted connection method that adopts moment method or corner method among the prior art, can further reduce the dispersion coefficient more than 20%.
In addition, the blade root bolt fastening device can be used for stopping at any time to detect the axial force of the blade root bolt after the unit normally operates, so that the bolt can be determined when to be screwed down according to the real axial force of the blade root bolt, and the operation and maintenance of the bolt of the wind generating set enter a new era of predictive maintenance.
In addition, the blade root bolt fastening device can ensure that the real axial force of bolt installation is measured when the wind generating set is hoisted, and the problem of axial force dispersion caused by equipment guiding and torque coefficients is solved.
The advantage brought by reducing the discrete coefficient of the bolt pretightening force (or the axial force) is that: the design pre-tightening force of the bolt can be increased (for example, at least 10% can be increased again); the fatigue strength of the bolt is improved, and the service life of the bolt is prolonged; the same node uses fewer bolts, and the material utilization rate is improved; the operation and maintenance times of the bolts are reduced, the cost is saved, and the like.
While the present invention has been particularly shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims (e.g., various features of the invention may be combined to obtain new embodiments). Such combinations, modifications and improvements are intended to be within the scope of the invention.
Claims (8)
1. The utility model provides a wind generating set blade root bolt fastening device which characterized in that, wind generating set blade root bolt fastening device includes:
a torque wrench (11) for generating a rotational torque;
a force translation tool (12) having a first hole to receive the rotating head of the torque wrench (11) and a second hole to receive a blade root bolt (20) for transmitting the rotating torque generated by the torque wrench (11) to the blade root bolt (20);
and the ultrasonic probe (13) is fixed on the blade root bolt fastening device of the wind generating set and used for sensing the axial force of the blade root bolt (20) in real time.
2. The wind turbine blade root bolt fastening arrangement according to claim 1, characterized in that the torque wrench (11) is an electric wrench, the wind turbine blade root bolt fastening arrangement further comprising a controller (15), the controller (15) receiving a signal from the ultrasonic probe (13) indicating an axial force of the blade root bolt (20) and generating a rotational speed control signal based on the signal and providing the rotational speed control signal to the torque wrench (11).
3. Wind park root bolt fastening arrangement according to claim 1 or 2, characterised in that the ultrasonic probe (13) is arranged directly above the second hole.
4. Wind park blade root bolt fastening arrangement according to claim 1 or 2, characterized in that the ultrasonic probe (13) is arranged in the second hole without contacting the wall of the second hole.
5. Wind park root bolt fastening arrangement according to claim 1 or 2, characterized in that the second hole is adapted to receive a bolt head (21) of the root bolt (20), the ultrasonic probe (13) being adapted to align the bolt head (21) in the axial direction of the root bolt (20) for measuring the axial force of the root bolt (20) in real time.
6. Wind park blade root bolt fastening arrangement according to claim 1, characterised in that a first rotatable part (121) matching the rotating head of the torque wrench (11) is arranged in the first hole and a second rotatable part (122) matching the bolt head (21) of the blade root bolt (20) is arranged in the second hole.
7. Wind park blade root bolt-fastening arrangement according to claim 6,
the force translation tool (12) comprises a torque transmission component for transmitting torque between the first rotatable component (121) and the second rotatable component (122).
8. Wind turbine blade root bolt fastening arrangement according to claim 1, characterized in that the ultrasonic probe (13) is an electromagnetic ultrasonic probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922447694.4U CN211219563U (en) | 2019-12-27 | 2019-12-27 | Blade root bolt fastening device of wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922447694.4U CN211219563U (en) | 2019-12-27 | 2019-12-27 | Blade root bolt fastening device of wind generating set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211219563U true CN211219563U (en) | 2020-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922447694.4U Active CN211219563U (en) | 2019-12-27 | 2019-12-27 | Blade root bolt fastening device of wind generating set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211219563U (en) |
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2019
- 2019-12-27 CN CN201922447694.4U patent/CN211219563U/en active Active
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Address after: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Patentee after: Jinfeng Technology Co.,Ltd. Address before: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Patentee before: XINJIANG GOLDWIND SCIENCE & TECHNOLOGY Co.,Ltd. |